Measuring material length parameter with a new solution of microbend beam in couple stress elasto-plasticity

Ji, Bin,Chen, Wanji Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.2

컴퓨터 사고력 핵심능력에 따른 엔트리와 스크래치간 기능 비교

임지빈 ( Jibin Im ),이태민 ( Taemin Lee ),채정민 ( Jungmin Chae ),정영희 ( Younghee Jung ) 한국컴퓨터교육학회 2018 한국컴퓨터교육학회 학술발표대회논문집 Vol.23 No.1

정보교과가 더욱 강화된 시점에서, 컴퓨팅 사고력을 키우는 것이 점점 중요해짐에 따라 국내 정보 교육에서는 컴퓨팅 사고력 함양을 위한 프로그래밍 수업으로 스크래치와 엔트리가 자주 사용되고 있다. 본 논문에서는 이들 언어가 컴퓨팅 사고력의 핵심능력 9가지를 함양하기 위한 도구로써 어떤 기능을 제공하고 있는지 비교·분석하였다. 스크래치와 엔트리 모두 컴퓨팅 사고력의 핵심능력을 학습할 수 있는 기본기능을 제공하고 있으나 엔트리가 자료수집, 자료표현, 문제분해 및 추상화, 알고리즘 절차화, 자동화, 시뮬레이션, 병렬화 능력에서 다양한 자료수집 기능과 복잡한 문제를 분해하고 추상화하는 기능, 개별 장면에 따른 시뮬레이션 기능을 제공함으로써 학습자가 알고리즘을 구현하는데 더 용이하며 문제해결과정을 작성함에 있어 다양한 표현방식을 제공하고 있다.

Determination of Optimal Build Orientation Based on Satisfactory Degree Theory for RPT

Zhao, Jibin,Liu, Weijun,Wu, Jianhuang Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1

In rapid prototyping, the optimal part orientation during fabrication is critical as it can improve part accuracy, minimize the requirement for supports and reduce the production time. Through investigating the geometric issues of STL model and process planning of RPM, This paper establishes optimizing model based on the considerations of staircase effect, support area and production time. The general satisfactory degree function is constructed employing the multi-objective optimization theory based on the general satisfactory degree principle. The best part-building orientation is obtained by solving the function employing generic algorithm. Experiment shows that the methods can effective resolve the part-building orientation in RP.

The Research of Relationship between SICSFCL and Distance Relay Protection of Power Grid

Wang, Jianzhong,Cui, Jibin,Xiong, Zhiquan,Zi, Meirong The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.2

A Saturated Iron Core Superconducting Fault Current Limiter (SICSFCL) provides a powerful fault current limitation in high voltage and high capacity power grid. A 35kV/90MVA SICSFCL was installed in a 35 kV network for live-grid operation, in January 2008 at Puji substation, Kunming, China. With deep research on SICSFCL, the matching problem between SICSFCL and relay protection currently needs to be solved. This paper analyzes the influence that SICSFCL brings to the distance relay protection which is used widely in high voltage power grid, and considering the characteristics of microcomputerbased protection, this paper proposes a new algorithm to eliminate the influence.

Superhydrophobic and smart MgAl-LDH anti-corrosion coating on AZ31 Mg surface

Manyi Huang,Guangming Lu,Jibin Pu,Yujie Qiang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-

Layered double hydroxides (LDHs) have been widely used as ‘‘smart” containers in the field of metal corrosionprotection, and have broad industrial prospects. It is environmentally friendly and feasible to usealiphatic carboxylates and corresponding acids as substitutes for harmful corrosion inhibitors. However,previous studies rarely involved comparing the anti-corrosion mechanisms of different aliphatic acidsmodified on the LDH surface, and the durability of the prepared coatings also needs to be improved. Inthis work, MgAl-LDH laminates were grown in situ on AZ31 substrates by a hydrothermal method,and then modified by sodium laurate (SL) and sodium dodecylbenzene sulfonate (SDBS). Due to the physicalbarrier effect of the LDH layers, the spatial repulsion effect of the air film and the ion exchange reactionsin the interlayer galleries, the functional coatings prepared exhibit smart and superior anticorrosionperformance on the magnesium substrates in 3.5 wt.% NaCl solution. Compared with LDHSDBS-8 coating, the obtained superhydrophobic LDH-SL-8 coating shows more excellent long-term corrosionprotection owing to the stronger intercalation capacity.

Low Cost Fabrication of UV Photodetector Based on Hexagonal Nanocrystal ZnO:Al/p-Si Heterojunction

Li Duan,Feng Wei,Jibin Fan,Xiaochen Yu,Wenxue Zhang,Yan Zhang,Fengni He,Xiaojiao Cheng,Ye Tian 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2

ZnO:Al/p-Si heterojunction was fabricated by depositing a hexagonal nanocrystal ZnO:Al film on p-type Si substrate using a simple chemical bath deposition (CBD) method. The vertically aligned hexagonal ZnO:Al nanocrystals reduce the grain boundary scattering and provide good conductivity. The ZnO:Al/Si heterojunction shows obvious photocurrent under ultraviolet (UV) illumination. A high UV-to-visible rejection ratio of the ZnO:Al/Si heterojunction indicates that the hexagonal nanocrystal ZnO:Al film is a good material for fabricating UV photodetectors. Furthermore, the response speed of the photodetector based on ZnO:Al hexagonal nanocrystal film is faster than that of most previously reported photodetectors based on ZnO:Al nanorods. We infer it is because the ZnO:Al nanocrystals film has a smaller surface to volume ratio than the ZnO:Al nanorod array.

한국 대학생의 정치의식과 능력주의가 통일인식에 미치는 영향에 관한 연구

이수빈 ( Subin Lee ),안지빈 ( Jibin Ahn ),이세환 ( Saehwan Lee ),오세일 ( Seil Oh ) 연세대학교 통일연구원 2023 통일연구 Vol.27 No.1

본 연구는 한반도의 복잡한 지정학적 배경 위에서 통일에 관한 대학생들의 의식을 경험적으로 조사하는 데 그 목적이 있다. 오늘날 한국 사회에서 대학생들은 시장 중심의 능력주의와 개인주의의 심화, 그리고 정치적 양극화로 인하여 정치에 무관심하거나 남북 관계와 통일에 관하여 무감각 혹은 부정적으로 인식할 가능성이 크다. 그러나 미래 세대의 주역인 대학생들의 통일인식은 앞으로의 대북·통일 정책 수립에 지대한 영향력을 미칠 것이기 때문에, 대학생의 정치의식 및 능력주의와 통일에 관한 탐색적 연구는 시의적으로 매우 중요하다. 본 연구에서는 2022년 서울 소재 대학생을 대상으로 307명의 설문 응답을 수집하였으며, 다양한 정치의식[정치 성향, 정치 효능(내적/외적), 국가 효능(한반도/대한민국)]과 능력주의를 측정하는 문항을 활용하여 ‘통일의 필요성’과 ‘통일지지도’에 대한 기초통계분석과 다중회귀분석을 수행하였다. 경험분석 결과, 대학생들은 보수적 정치 성향과 능력주의적 신념이 강할수록 통일의 필요성에 반대하며, 통일 지지도 또한 낮아지는 경향을 나타냈다. 한편, 한반도 국가 효능에 대한 의식이 높을수록 통일의 필요성과 통일 지지도가 높아지는 경향이 나타났고, 대한 민국 국가 효능이 높을수록 통일 지지도가 높아지는 경향을 확인하였다. 또한, 정치 성향, 능력주의와 통일의 필요성, 통일 지지도 사이에 유의한 성별 조절효과가 나타났다. 분석 결과를 바탕으로 본 연구는 대한민국에 배태된 대학생의 민족 인식을 한반도 전체로 확장하고 남북한 협력의 긍정적 영향을 강조하는 통일 교육의 필요성을 제시한다. The purpose of this study is to investigate university students’ perceptions of unification in the geopolitically complex Korean Peninsula. In contemporary Korean society, university students are more likely to be apathetic or hold negative perceptions of inter-Korean relations and unification of the Korean Peninsula due to the intensification of market-driven meritocracy, exclusive individualism, and political polarization. As such, exploratory research on university students’ political consciousness and perceptions of unification is both timely and crucial, as their attitudes will significantly impact the establishment of future inter-Korean relations and unification policies. In this study, we collected 307 survey responses from university students in Seoul in 2022, utilizing surveys that we designed. We conducted basic statistical analysis and multiple regression analysis on two conceptually distinct perceptions of unification: the need for unification and the support for unification, using items measuring meritocratic belief and various political consciousness elements such as political orientation, political efficacy (internal/external), and national efficacy (South Korea/Korean Peninsula). The results indicate that the stronger the conservative political orientation and meritocratic beliefs of university students, the more they opposed the need for unification and the lower their support for unification, whereas higher Korean Peninsula national efficacy tends to positively increase both perceptions of unification. The study also found significant gender interaction effects for political orientation and meritocratic belief on the perceptions of unification. These findings suggest the necessity for unification education that promotes ethnic awareness among university students and emphasizes the positive effects of inter-Korean cooperation.

초소형 초음파 영상 시스템을 위한 효율적인 소수채널 빔포머 설계

이유화(Yuhwa Lee),성지빈(Jibin Sung),김기덕(Gi-Duck Kim),조정(Jeong Cho),송태경(Tai-Kyong Song) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11

본 논문에서는 선형주사와 곡면주사를 사용한 초음파 장치의 전단부 크기를 줄이기 위하여 폴딩 기법과 결합소자 희박 어레이 기법을 사용한 전단부 구조를 제안한다. 제안된 구조는 두 가지 방법을 결합하여 사용함으로써 해상도 및 SNR 저하를 최소화하면서 활성 채널 수를 줄일 수 있는 장점을 가진다. 또한 적은 수의 고전압 스위치만을 이용하여 제안된 방법을 구현할 수 있는 방법을 함께 제안한다. 제안된 구조는 활성 채널 수가 줄어든 만큼 전단부에서 가장 큰 면적을 차지하는 펄서(pulser)와 리미터(limiter)의 수를 줄일 수 있기 때문에 기존의 방법과 비교하여 면적을 크게 줄 일 수 있다. 제안한 방법은 유효 채널 수가 64인 시스템의 경우 기존의 방법과 비교하여 전단부의 하드웨어 면적을 62% 줄일 수 있다.

EFFECT OF MACROMOLECULAR COUPLING AGENT PMMA-b-PVTES ON STABILIZING NANO-Si3N4

HUI ZHU,Jiasheng Qian,Peng Chen,JIBIN MIAO,RU XIA,Bin Yang,LIFEN SU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.8

Poly(methyl methacrylate)-b-poly(vinyltriethoxysilane) (PMMA-b-PVTES) are synthesized using atom transfer radical polymerization (ATRP) and used as macromolecular coupling agents to modify silicon nitride nanoparticles (nano-Si3N4). The chemical composition of copolymers PMMA-b-PVTES and modified nano-Si3N4 are confirmed by various characterization techniques. The modified nano-Si3N4 shows excellent hydrophobic nature, which make nanoparticles (NPs) stably disperse in organic solvent. Transmission electron microscope (TEM), particle size testing, contact angle measuring and sedimentation experiment are employed to examine the dispersion of modified nano-Si3N4 in chloroform. By comparing the effects of copolymers with varied number-average molecular weight (Mn) and block length ratio on stabilizing nano-Si3N4, we discussed the mechanism of macromolecular coupling agent stabilizing NPs. In our experiments, the copolymer PMMA88-b-PVTES17 is found to be the most effective macromolecular coupling agent for stabilizing nano-Si3N4.

Preparation and Study on Thermal Conductive Composites of Chlorinated Polyethylene Rubber Reinforced by Boron Nitride Particles

Junjie Shu,Ru Xia,Jiasheng Qian,JIBIN MIAO,LIFEN SU,Ming Cao,Hongyun Lin,Peng Chen,Jinyang Chen 한국고분자학회 2016 Macromolecular Research Vol.24 No.7

The composites of chlorinated polyethylene rubber (CM) filled with boron nitride (BN) were prepared and examined systematically. Scanning electron microscopy (SEM) was used to observe microscopic morphology of composites. Mechanical properties of composites were analyzed by a rubber process analyzer (RPA) and dynamic mechanical thermal analyzer (DMTA). Thermal conductivity as well as thermo stability of composites was improved by adding BN particles into the CM rubber. It was found that BN particles can reinforce the rubber matrix while they also break down the network of polymer chains and ruin the physical properties of the rubber matrix. During the dynamic compressing process, BN particles can transfer heat from the matrix and alleviate the heat build-up phenomenon. The BN/CM composites (volume content CBN=18%) with thermal conductivity 1.179 W/(m·K) and good flexibility (Elongation at break=320%) were prepared, which may be used as thermal interface materials in a dynamic compressing process.